Still haven't decided 100% whether to upgrade to a solid roller for my MTI 427 LQ4 in my 98 A4 C5. <img border="0" alt="[burn out]" title="" src="graemlins/gr_burnout.gif" /> Presently, i am leaning toward sticking with aggressive MTI S1 hyd. cam.

I heard before (from the likes of persons like NINEBALL) that A4 LS1 cars (mine is a C5) do not like solid roller set ups that much. Not sure what he meant by this and does anyone have an opinion regarding the compatability of a solid roller in a A4. I also heard that some A4 cars do not pick up much more power with a solid roller vs. good aggessive hyd cam. The S1 cam i am leaning towards is hydraulic with specs of 244/244, .612 lift and a 112lsa.

Is it more feasible to run a solid roller LS1 in a M6 car and if yes why? Need to make up my mind quickly and like to hear the pros and cons here concerning solid roller and A4s.

THanks for all info.

MTI 427 C5 Roadster <img border="0" alt="[burn out]" title="" src="graemlins/gr_burnout.gif" />

 

Solid rollers are most definitely compatible with A4s. A properly selected solid roller cam has the ability to make more power across the nearly the entire RPM band. Obviously, this is helpful on both A4 and M6 cars. The only problem I see is being able to apply the added power to the pavement. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Jason

 

TTT Nobody else have any info here to add? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

MTI 427 C5 Roadster

 

"I heard before (from the likes of persons like NINEBALL) that A4 LS1 cars (mine is a C5) do not like solid roller set ups that much."

I think you misunderstood what Tony meant (ask him.) The engine doesn't know what kind of tranny is behind it. The solid lift cam will make more power than a hydraulic cam no matter what tranny you're running.

 

BTW, he may have meant that an A4 doesn't hold up to the power as well as an M6.

 

COLONEL:

I do believe that Tony may have certainly meant that the A4 does not hold up to the power of a solid roller (from a durability issue)when compared to a M6. That is probably what he meant.
Of course i emailed him back asking if that is what he meant and given his busy schedule he was not able to respond (which is certainly understandable).

Colonel, do you believe i should build the MTI 427 with a solid roller vs. the S1 cam for my C5 which will be street weekend warrior, which will see ocassional drag strip action and what is the reasons for your opinoins. Will tunig be more of a challenge on a computer car with an aggressive solid roller (similar to what SW is running) vs. the S1 or is the only drawback with the solid roller the extra money and having to keep an eye on the valve lash, etc. I appreciate your valued input here as i have been struggling with the decision of S1 cam vs. solid roller for my 427.

Thanks,

MTI 427 C5Roadster <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

The only drawbacks of the solid lift cam are...

The money. Only YOU can decide if the extra money is worth another 30 RWHP or so.

The adjustments. Are you comfortable doing them or paying to have someone else do it?

The valvetrain noise. It'll be noisier under the hood. If you want stealthy then you don't want a solid lift. If a fairly knowledgable person hears it they'll know what's up.

I think for a weekend warrior the S1 will do just fine. It would be the better bang for your buck. It did take me all the way to 9.82 you know. 525+ RWHP can be had with this cam. How much can you use on the street?

But, if you just gotta have the biggest and baddest then you gotta have the solid lift cam.

A solid lift cam idles SMOOTHER than a hydraulic cam for a given power level. This means, according to which one you pick, you might have a better idle (making it easier to tune for streetability) than the S1 AND more power.

 

COLONEL:

Thanks for the great input and advice. Last question Colonel is whether MTI will have a more difficult time tuning my pcm with the solid roller vs the S1. I have heard some rumblings about difficulies associated with solid roller cams and computer cars.

Will the tuning be a problem with a solid roller similar to what SW was running in his black FRC and is my car likely to idle better also during cold starts with the solid roller (as i know of a few stroker A4 LS1 guys that have to two step their car upon cold starts, etc.

Thanks man,

MTI 427 C5 Roadster

 

I'm not real familiar with SW's cam. I could only guess at what the specs are.

I'd call Jayson at MTI and get his take on the tuning (since he'll be the one doing it.) I think he'll tell you that with an idle set somewhere around 950 it'll be no problem.